A Calm V8 against a Chirping one. The Tundra's risks are free fixes; the Chevy's are a coverage clock and a coin flip.

The good-news issue. On 2020–2022 trucks the 8-speed's transmission control valve can wear and lose pressure, causing harsh shifting, a service-engine-soon message, reduced performance, or a P0747 code. GM addressed it with a Special Coverage that runs 15 years or 150,000 miles from the original in-service date, regardless of ownership, installing a new control valve body free — and reimbursing owners who already paid. That's rare and valuable: it means a common Silverado transmission complaint has a documented free remedy on this year. Confirm the truck is within the 15yr/150k window and whether the valve was already replaced.

Sources: NHTSA recall database and manufacturer communications (transmission-valve Special Coverage; recall documents)

The uncovered risk. 2020 is all-DFM, the lifter system mechanics say fails more often and earlier than the older AFM. A collapsed lifter brings a tick, misfire, power loss, and often camshaft and pushrod damage — a $3,000–$10,000 repair with no blanket recall behind it, only a class action and reactive, sometimes-denied warranty repairs. A DFM disabler (~$150) is cheap prevention; a cold-start tick is the tell to walk. This is the single most important thing to check on a 2020.

Sources: NHTSA complaint database, 2020 Silverado 1500 · Independent mechanic channel transcripts (T1XX Silverado; AFM/DFM lifter deep-dives)

Alongside the lifter issue, the DFM V8s can burn oil — owners in the file report a quart every 1,500–2,000 miles, and GM considers up to a quart per 2,000 within spec, which owners find cold comfort. The oil-cooler lines can also seep at the crimp. Check the oil level and look for leaks or a burning-oil smell; a truck that needs regular top-ups is telling you something about the engine's health.

Sources: NHTSA complaint database, 2020 Silverado 1500 · Independent mechanic channel transcripts (T1XX Silverado; AFM/DFM lifter deep-dives)

Recall 20V-682 (Toyota 20TA02) adds the 2019–2020 Tundra: the in-tank low-pressure fuel pump can fail and stall the engine. The remedy is a free improved pump, and a December 2022 settlement created a Customer Support Program (CSP — quiet extended-warranty coverage) for certain 2014–2020 vehicles whose pumps were repaired. Several 2020 owners describe exactly this loss-of-power-at-speed symptom and tie it to the campaign; confirm it shows completed by VIN.

Sources: NHTSA complaint + recall database, 2020 Tundra · NHTSA recalls and manufacturer communications (recall documents, fuel-pump settlement CSP, Toyota internal codes)

The loudest recurring item in the 2020 file: the sunroof shattering with no impact — 'sounded like a loud pop,' glass typically blowing upward and out, sometimes landing on the closed interior shade. Multiple owners report it at highway speed in clear conditions, and a related pattern involves the sunroof cables seizing (tied by one dealer to a technical service bulletin). There is no recall. Comprehensive insurance is the practical backstop. Inspect the glass and ask about any prior glass claim on a moonroof-equipped truck.

Sources: NHTSA complaint + recall database, 2020 Tundra

Two owner-reported characteristics. A steering-wheel shimmy and front-end vibration at highway speed appears in several 2020 filings; owners chase it through balancing and alignments while dealers call it normal — on a body-on-frame truck it is usually tires and needs a road-force balance, though a few owners escalated. Separately, a handful of owners report the engine failing to start in extreme heat (110°F-plus) and restarting after it cools; dealers struggle to replicate it. Drive at highway speed for the shimmy and, if you are in a hot climate, ask about any hot-start history.

Sources: NHTSA complaint + recall database, 2020 Tundra · Independent mechanic/owner channel transcripts (Car Care Nut XK50 buying guide; 5.7L 3UR-FE breakdown)